I.S. Consulting has donated a native driver modeled on the PostGIS driver
to support SQL Server 2008’s newly added spatial capabilities. This new
driver will only be available on the Windows platform, and it will only
be available as a PLUGIN datasource driver. No additional enumerations or
conditional includes will be added to the MapServer codebase to support this
driver.

A single file, mapmssql2008.c will be added to subversion. It will only be
compiled on windows using the ‘nmake /f makefile.vc plugins’ command when
options describing the ODBC libraries are switched on.